docs: def view_global_hmaps(token, dstore):
      """
      Display the global hazard maps for the calculation. They are
      used for debugging purposes when comparing the results of two
      calculations. They are the mean over the sites of the mean hazard
      maps.
      """
      oq = dstore['oqparam']
      dt = numpy.dtype([('%s-%s' % (imt, poe), F32)
                        for imt in oq.imtls for poe in oq.poes])
      array = dstore['hmaps/mean'].value.view(dt)[:, 0]
      res = numpy.zeros(1, array.dtype)
      for name in array.dtype.names:
          res[name] = array[name].mean()
      return rst_table(res)